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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced7a04d0e75e556b657a9ef7e43e6d3947f44ab956ea41bcc021905e53170af' 
  AND token = '2QCICP9XLUBJ54OiwSJkh7H6dQRX3IBAkHT3Ha0i/yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}